The green area gives an example of how and why the growth in the income of the top earners has caused the increase in taxes they pay

    1992 tax rate   % of total  After tax Income      
  Income in 1992 Tax rate Tax amt tax collected      
Top 10% $1,000,000 26.00% $260,000.00 97.20% $740,000.00      
Lower 90% $50,000 15.00% $7,500.00 2.80%      

    Current   % of total 

  Income now Tax rate Tax amt tax collected

Top 10% $10,000,000 17.00% $1,700,000.00 $0.9965 $8,300,000.00

Lower 90% $50,000 12.00% $6,000.00 $0.0035



1 - Notice how the income has grown from 1992 to 2011. The Income of the top 10% is 10 times that of 1992

2 - The Income of the lower 90% has not grown or has decreased

3 -Because of the increase income of the top 10%, their total taxes collected have increased and their share of that has also increased
4 - Because the income of the lower 90% has not increased, their taxes have not increased or have actually decreased.

And their share of the total collected taxes have decreased

The high income earners have seen their tax rate go from 26% to 17% since 1992

Looking back even further to 1915, an era in which the Rockefellers and Carnegies dominated American industry,  

the richest 1% of Americans earned roughly 18% of all income.
Today, the top 1% account for 24% of all income.

A small percentage of the top earners pay a very high percent of all the taxes collected
Ask him/her (or look it up yourself) what percentage of all income that small percentage of top earners make
The top earners pay a large percentage of the total taxes paid because they make a very large percent of the total income.

The share of total income going to the top 1 percent of earners, which stood at 8.9 percent in 1976, rose to 23.5 percent by 2007 
but during the same period, the average inflation-adjusted hourly wage declined by more than 7 percent.

For it turns out that rising inequality has created enormous losses and few gains, even for its ostensible beneficiaries.